SNSUC writes batch-level product carbon footprint (PCF) to the blockchain and uses a browser-side SHA-256 fingerprint to tamper-evidently attest digital warehouse receipts, closing the loop from title to carbon data. The mechanism aligns with the national ETS expansion and the CBAM carbon border adjustment, making digital receipts quantifiable ESG evidence that supports enterprise members' carbon compliance and export documentation.

Petrochemicals enter the national ETS in 2027 at a carbon price near ¥90/t; EU CBAM enters its payment phase, internalizing carbon cost for rubber and lubricant exports. Base-oil carbon intensity falls to 1.7 tCO2e/t as digital warrants carry carbon labels on-chain, letting cross-border buyers verify product footprints with one click. Treat the carbon label as a new pricing factor in re-export.

EU CBAM and downstream carbon-disclosure rules force cradle-to-gate accounting across petchem re-exports. SNSUC models full-lifecycle carbon for base oil/lubricants; paraffin (rising food-grade share) and butadiene rubber win green-premium orders via low-carbon routes, with digital warrants carrying carbon labels—feeding the platform's ESG tracking module.

Tighter ESG disclosure for exporters and listed firms makes product carbon footprint (PCF) a new trade gate; SHA-256 fingerprints can anchor the accounting trail.